Improvement in machines for making paper-pulp



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I Witnesses mventor UNITED STATES PATENT, OFFICE.

IVARNER MILLER, OF HERKIMER, NEW' YORK, ASSIGNOR TO'NATIONAL WOOD FIBRE COMPANY, OF NEIV YORK CITY.

IMPROVEMENT IN MACHINES FOR MAKING PAPER-PULP.

Specification forming part of Letters Patent No. 77,829, dated 4May 12,1868.

To all whom it may concer-n:

Be it known that I, WARNER IVIILLER, of Herkimer, in the county of Herkimer and State of New York, have invented a new and Improved Machine for Making Paper-Pulp; and

y I do hereby declare that the following is a full,

Thepresent invention relates, rst, to an` improved mode of operating the followers, whereby the wood to be ground is pressed against the periphery of the stone, a positive mechanical device being used in the original patented machine, whereas I employ springs or weights, arranged and applied as hereinafter set forth, whereby the machine isgreatl y simplified, and made to operate'in amore perfeet manner. v

The invention relates, second, to an improvemen tin the screening apparatus, as hereinafter fully shown and descr1bed,whereby the pulp is not only deprived of all coarse foreign substances, but also separated or divided into two or more different qualities, with respect to the length and diameter of its ber, whereas the original machine separated the pulp with re-` spect only to the diameter ot'. its fiber, the

' diiferent parts thus separated discharged from the machine, as before, at separate points, so that they cannot mingle with each other.

In the accompanying sheet of drawings, Figure 1, Sheet No. 1, is a side sectional view of my invention, taken in the line a: Jv, Fig. 2;

Fig. 2, a horizontal sectionofthe same, taken in theline y y, Fig, l. Fig. 3, Sheet No. 2,is a side sectional View ot' the screening apparatus, taken in the line z z, Fig. 4; Fig. 4, a plan or top view of the same.

`Similar letters of reference indicate corresponding parts.

A represents a box or case, in which the grindstone Il is placed, and revolves in a vertical plane, the greater portion ofthe upper part ot' the stone being covered by a detachable cap, C. 'lhe box or case and the grindstorie may be constructed and arranged substantially as shown in the Letters Patent of the original machine.

The box or ease A is constructed with an extension, D, in which two followers, E E', and their concomitant parts, are placed. These followers,in connection with spri n gs or weights, serve to feed the wood under process of grinding to the stone.

lIlle arrangement of the parts by which this endis attained may dii'er slightly or be modified in dift'erentways, and still be, in a patentable sense, substantially the saine, or mechanical eqnivalents.

The lever-follower F, extending outward and centrally from its back at right angles, and passing loosely' through a. cross-head, G, and a ixed crossbar, H, the ends o f the. crossbar G being titted in notches in cleats a, attached to the extension. On the rod F, between the crosshead Gr andthe fixed cross-bar H, there is placedA a .spiral spring, I, which presses the follower in a direction toward the stone, and presses the wood, J, to be ground, againstthe stone.

The wood J is previously gotten out of the proper dimensions and steamed, so as to facilitate' the grinding process,ra'nd is placed in front of thefollower E, between it and the stone, through a door, b, in the side of the extension, the wood and-follower resting-upon a slightly-inclined plate or bed, c.

The strength cti-the spring I should be 'such as to press the wood s uiciently hard against theperiphery of the stone.

,In lieu of a spiral spring, I, a fiat spring, K, may be employed, as shown in red in Fig. l, said spring bearing against the outer end of the rodF, and having its lower end pivot-ed to fa projection, d, on the base of the case or box A. By this arrangement the spring K may be turned down out of the way when it is necessary' to draw back the follower for lthe insertion of a piece of wood, and if the spiral spring I he used the follower may be relieved yof its pressure, when it is necessary to insert a piece of wood, by turning the cross-head G',

E .is provided with a rod, I

so that its ends will pass out of the notches in` the cleats a. Either or both of the springs I K may be used, as desired. Y

A weight and leyer may be employed in lieu of springs, and the upper follower; E, is represented as being thus actuated. In this plan the lever L lhas its fulcrum `E' at the outer end and upper part of the extension D, the lower end of said lever bearing against the outer end of the follower-rod M, and the upper end having a cord, j', att-ached, which passes ,over one or more pulleys, with a weight secured to its lower end. The wood to be ground .is adjusted between the upper follower, E', and the stone through a door, g, in the top of the extension l).

By` the means above described-either the springs or the weight-the wood iskept pressed against the stone until entirely ground up, and new pieces -may be inserted with the greatest facility.

This improvement greatly sim plitics the construction of the machine, materially reducing the cost of its construction, and causing a more uniform or equal pressure ot' the followers' against the wood.

In the original machine complicated gearing is employed, the operation of which is attended with considerable friction, and colisequently unreliable in its action,and notl so sensitive or yielding in caseof any foreign substance being drawn in between the wood and the stone.

I would remark that in my improved ma chine, as well as in the original, a stream of clean water -ispoured upon rthe woodwhile bein g ground or acted upon by the stone, the mixture of the ground wood with the water forming a pulp, whi'ch passes from the box or case A through an opening, 112, and is'discharged upon a screening apparatusvhich is constructed as follows:

N represents a box, of rectangular form, in the upper part of which a shoe," O, is placed, having within it two screens, PP', placed one above the other, as shown in Fig. 3. This shoe at one end is attached to a rockshaft, Q, and the opposite endrests upon a ratchetshaped Gann-R, which is upon a shaft,

S, that passes transversely through the box N. This cam R, when the shaft S is rotated, gives an up-and-down shake motion tothe shoe,.the cam raising the shoe by its prominences, the shoe, as each prominence passes it, falling by its own gravity.

The screens, instead of being constructed of wire, (sieves,) as in the original machine, and having a square mesh, are constructed of metal plates perforated with oblong slots, the width of which is .equal to the thickness of the tlber designed to pass through it. The stock is thus separated or divided aceordin g to the quired in all kinds of stock.

thickness ofthe fiber, a long fiber heilig re- The upper screen, 1, 'is-...coarserthan the lower one, P 5 and the upper screen, l, has a curved spout or chute, T, attached to it, which discharges all ber that is too coarse to pass through the upper screen off from one side of the box N. The pulp whichl passes through the top screen, P, falls upon the lower and vliner one, Pza-ud vthe finer portion of the pulp passes through the lower screen, l", and drops into the lower part of the box N, while the -coarser portion of the pulp passes oft' from the outer Aor discharge end of the screen l, the finest pulp being discharged through an opening, hx, at one side of the lower part of the box N.

It will be seen from the above description that the two different kinds of pulp are discharged from the screening apparatus at different points, so that the several parts cannot become mixed; and it will also be seen that more than two screens may he used if it is desired to divide the pulp intomore than two diierent kinds of stock.

The pulp is made to dow direct from the box or case A upon the upper screen, P, near the rock-shaft end .ofthe shoe, the latter having a slight-inclination, to admit of the pulp flowing' by its own gravity, ineonnection with the shake-motion, over the screens.

Having described my invention, what I claim as new, and desire to secure by Letters vlatenhisl. The operating of the followers E E', or, in other words, the feeding of the wood to the grindstone, by means of springs or a lever and weight, arranged'substantially as herein shown and described, and for the purpose specified.

2. The particular application of the springs I K, as shown, to admit of the followers being relieved of their pressure whenever it is required to withdraw the followers for theinsei-tion of the wood to be ground.

3. The placing of two or more screens, I P', olie above the other, in a shoe, Q, pla-ced Ain 'a suitable box, N, and having a shake-motion communicated to it by lneans of a cam, 1t, or its equivalent, when such device is used in connection with or applied to a machine for making paper-pulp, substantially as set forth'. i

4. The curved spout or chute T, attachedto .the upper screen, P, when said spout or chute -is used in connection with a shoe containing two or more screens, and all arranged in such a. manner as to admit of the dividing or separating ot' the pulp-into two or more kinds or qualities of stock, substantially as set forth.

i WARNER MILLER.

Witnesses: I

WM. F. MCNAMARA, ALEX. F.' ROBERTS. 

